Ballpoint pen



FIG. 1 is a perspective view of front, top and right side of a ballpoint pen showing my new design;

FIG. 2 is a front view thereof, the rear view being a mirror image thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is an exploded front view thereof; and,

FIG. 8 is an exploded top view thereof.

The broken lines shown are included for the purpose of illustrating unclaimed portions of the ballpoint pen that form no part of the claimed design. 

CLAIM The ornamental design for a ballpoint pen, as shown and described. 